{"id":200596,"date":"2025-05-06T12:09:21","date_gmt":"2025-05-06T04:09:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200596\/"},"modified":"2025-05-06T12:09:21","modified_gmt":"2025-05-06T04:09:21","slug":"sql-%e8%af%ad%e5%8f%a5%e6%b7%bb%e5%8a%a0-group-by-%e6%8a%a5%e9%94%99%e6%80%8e%e4%b9%88%e5%8a%9e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200596\/","title":{"rendered":"SQL \u8bed\u53e5\u6dfb\u52a0 GROUP BY \u62a5\u9519\u600e\u4e48\u529e\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>SQL \u8bed\u53e5\u6dfb\u52a0 GROUP BY \u62a5\u9519\u600e\u4e48\u529e\uff1f<\/h1>\n<p>\u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241109\/1731133296672eff707a081.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>sql \u8bed\u53e5\u6dfb\u52a0 group by \u62a5\u9519\u7684\u89e3\u51b3\u529e\u6cd5<\/strong><\/p>\n<p>\u5728\u4f7f\u7528 sql \u8bed\u53e5\u65f6\uff0c\u6709\u65f6\u6dfb\u52a0 group by \u5b50\u53e5\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002\u4e0b\u9762\u4ecb\u7ecd\u4e86\u8fd9\u4e2a\u95ee\u9898\u7684\u89e3\u51b3\u529e\u6cd5\uff1a<\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u5728 sql \u67e5\u8be2\u8bed\u53e5\u4e2d\u6dfb\u52a0 group by \u5b50\u53e5\u65f6\uff0c\u63d0\u793a\u9519\u8bef\u3002<\/p>\n<p><strong>\u7b54\u6848\uff1a<\/strong><\/p>\n<p>\u51fa\u73b0\u8fd9\u79cd\u9519\u8bef\u901a\u5e38\u662f\u56e0\u4e3a group by \u5b50\u53e5\u4e2d\u7684\u5b57\u6bb5\u503c\u4e0d\u552f\u4e00\u3002\u8981\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u9700\u8981\u5bf9\u975e group by \u5b57\u6bb5\u5e94\u7528\u805a\u5408\u51fd\u6570\uff0c\u4f8b\u5982 sum\u3001count \u6216 avg\u3002\u8fd8\u53ef\u4ee5\u4f7f\u7528 distinct \u5173\u952e\u5b57\u6765\u786e\u4fdd\u7ed3\u679c\u4e2d\u6ca1\u6709\u91cd\u590d\u7684\u884c\u3002<\/p>\n<p>\u5bf9\u4e8e\u9ad8\u7248\u672c\u7684 mysql\uff085.6 \u53ca\u66f4\u9ad8\u7248\u672c\uff09\uff0c\u8fd8\u6709\u4e00\u4e2a\u9650\u5236\uff1agroup by \u5b50\u53e5\u4e2d\u5217\u51fa\u7684\u6240\u6709\u5b57\u6bb5\u5fc5\u987b\u5728 select \u5b50\u53e5\u4e2d\u51fa\u73b0\uff0c\u6216\u8005\u4f7f\u7528\u522b\u540d\u6765\u5f15\u7528\u5b83\u4eec\u3002\u5982\u679c\u4e0d\u6ee1\u8db3\u6b64\u8981\u6c42\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u51fa\u73b0\u4ee5\u4e0b\u9519\u8bef\uff1a<\/p>\n<pre>error 1055 (42000): expression #1 of order by clause is not in group by clause and contains nonaggregated column 'table_name.column_name' which is not functionally dependent on columns in group by clause<\/pre>\n<p>\u53ef\u4ee5\u5c06 nonaggregated column \u91cd\u5199\u4e3a\u805a\u5408\u51fd\u6570\uff0c\u6216\u8005\u5728 select \u5b50\u53e5\u4e2d\u6dfb\u52a0\u522b\u540d\u3002<\/p>\n<pre>select sum(column_name) as sum_column_name, ...\ngroup by ...\norder by sum_column_name<\/pre>\n<p>\u6216\u8005<\/p>\n<pre>SELECT column_name AS c_name, ...\nGROUP BY ...\nORDER BY c_name<\/pre>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aSQL \u8bed\u53e5\u6dfb\u52a0 GROUP BY \u62a5\u9519\u600e\u4e48\u529e\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>SQL \u8bed\u53e5\u6dfb\u52a0 GROUP B&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200596","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200596","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200596"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200596\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}